CN205544953U - Random graph changes formula digit voltage regulator power - Google Patents
Random graph changes formula digit voltage regulator power Download PDFInfo
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- CN205544953U CN205544953U CN201620099972.5U CN201620099972U CN205544953U CN 205544953 U CN205544953 U CN 205544953U CN 201620099972 U CN201620099972 U CN 201620099972U CN 205544953 U CN205544953 U CN 205544953U
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Abstract
The utility model provides a random graph changes formula digit voltage regulator power, including AC input, interchange filter circuit, bridge rectifier filter circuit, boost circuit, full bridge inverter, feedback loop control circuit and little the control unit, wherein, the alternating current of input is in proper order after exchanging filter circuit and bridge rectifier filter circuit rectifying and wave -filtering, carry out voltage electric current double loop control through the boost circuit to bridge rectifier filter outlet's direct current, and then the direct current contravariant of exporting the boost circuit through full bridge inverter is the alternating current, full bridge inverter's output is again through the feedback loop control circuit's that receives the control of little the control unit closed loop feedback, thereby the virtual value that makes the alternating current of output is according to predetermineeing the scope random variation. The utility model discloses can satisfy a power demand who requires power supply voltage random variation and in certain extent's high precision equipment.
Description
Technical Field
The utility model relates to an alternating current power supply technical field, more specifically relates to a random curve variation formula digit constant voltage power supply.
Background
An ac regulated power supply is an electronic device that can provide a stable ac power to a device. Because the mains supply voltage is unstable, particularly the voltage fluctuation range of some power supply places is large, the fluctuation rule is not obvious, and the noise, higher harmonic and instantaneous high-voltage pulse of a power grid influence the normal work of the electric equipment, particularly for the power supply of some special equipment, if the power grid is directly connected for a long time, the damage of the electric equipment can be caused; in addition, for some special occasions, for example, when power is supplied to numerous high-precision equipment, the voltage output by the voltage stabilizer is required to be a sine wave, and the alternating-current effective value is required to fluctuate randomly within a certain range, while the alternating-current effective value output by the existing voltage stabilizer is constant, which obviously cannot meet the requirement.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the present invention provides a random-curve-variation digital ac regulated power supply to solve the problem that the ac voltage output by the existing ac regulator cannot meet the power supply requirement of the high-precision equipment.
The utility model provides a random curve variation type digital AC voltage-stabilized power supply, which comprises an AC input end, an AC filter circuit, a bridge rectifier filter circuit, a boost circuit, a full-bridge inverter circuit, a feedback loop control circuit and a micro control unit; the alternating current filter circuit is connected with the alternating current input end and is used for filtering input alternating current; the bridge rectifier filter circuit is connected with the alternating current filter circuit and used for converting alternating current subjected to filtering processing into direct current which is not stabilized; the boost circuit is connected with the bridge rectifier filter circuit, and voltage and current double-loop control is carried out on the direct current by adopting a PWM controller and a resistance voltage-dividing type closed-loop feedback circuit; the full-bridge inverter circuit is connected with the boost circuit and is used for inverting the direct current output by the boost circuit into alternating current; the feedback loop control circuit is connected with the full-bridge inverter circuit, the micro control unit is connected with the feedback loop control circuit, a random function is preset in the micro control unit, a random direct current signal is generated through the random function, and a feedback signal output by the feedback loop control circuit is formed by superposing the random direct current signal generated by the random function and an alternating current voltage sampling value; the alternating voltage sampling value is the sampling output of the full-bridge inverter circuit;
The feedback signal output by the feedback loop control circuit is connected to the full-bridge inverter circuit, and the effective value of the alternating current output by the full-bridge inverter circuit is controlled to randomly change within a preset range through the feedback signal output by the feedback loop control circuit.
Further, a preferable structure is: the bridge type rectifying and filtering circuit comprises two pairs of bridge arms and a first filtering capacitor; one end of the bridge rectifier filter circuit is grounded, and the other end of the bridge rectifier filter circuit is connected to the boost circuit.
Further, a preferable structure is: the boost circuit comprises an inductor, a field effect transistor, a fast recovery diode, a resistor, a second filter capacitor and a PWM controller; one end of the boost circuit is grounded, and the other end of the boost circuit is connected to the full-bridge inverter circuit.
Further, a preferable structure is: the full-bridge inverter circuit comprises an inverter main control chip, a bootstrap full-bridge driving circuit connected with the inverter main control chip, an inverter bridge circuit connected with the bootstrap full-bridge driving circuit and an LCL filter circuit; the bootstrap full-bridge driving circuit converts SPWM signals sent by the inversion main control chip into signals for driving the inversion bridge circuit, and the direct current output by the boost circuit is inverted into high-voltage alternating current through the inversion bridge circuit; the carrier signal in the SPWM signal is filtered through the LCL filter circuit, so that the high-voltage alternating current pure sine wave is output.
Further, a preferable structure is: the feedback loop control circuit comprises a current transformer, a rectifier bridge chip and a DAC chip; the current transformer is connected with the full-bridge inverter circuit and is used for converting high-voltage alternating current output by the full-bridge inverter circuit into low-voltage alternating current; the rectifier bridge chip is connected with the current transformer and used for converting low-voltage alternating current into low-voltage direct current, and the low-voltage direct current outputs an alternating voltage sampling value after voltage division and filtering; the DAC chip is connected with the micro control unit; the micro control unit is internally pre-provided with a random function, the random function generates a number within a preset range, the output value of the random function is refreshed along with the time overflow of a timer of the micro control unit, the micro control unit controls the direct current signal output by the DAC chip to change along with the randomly generated number, the random direct current signal output by the DAC chip and the alternating current voltage sampling value are jointly used as feedback signals to be connected to the inversion main control chip within the timer time of the micro control unit, and the alternating current effective value output by the full-bridge inversion circuit randomly changes within a certain range through the combined action of the random direct current signal and the alternating current voltage sampling value.
Further, a preferable structure is: the boost circuit is a direct current closed loop voltage stabilizing circuit; the full-bridge inverter circuit is an alternating current closed-loop voltage stabilizing circuit.
Further, a preferable structure is: the auxiliary power supply circuit is respectively connected with the boost circuit, the full-bridge inverter circuit, the feedback loop control circuit and the micro control unit and is used for respectively supplying power to the boost circuit, the full-bridge inverter circuit, the feedback loop control circuit and the micro control unit.
Further, a preferable structure is: the auxiliary power supply circuit adopts a non-isolated step-down topological structure; the auxiliary power supply circuit respectively outputs 12V voltage and 5V voltage, and the 5V voltage is obtained by linearly reducing the 12V voltage through low voltage difference; the 12V voltage supplies power for the boost circuit and the bootstrap full-bridge driving circuit; the 5V voltage supplies power to the inversion main control chip, the DAC chip and the micro control unit.
Utilize the aforesaid to be according to the utility model discloses a random curve changes formula digit alternating current constant voltage power supply, the alternating current effective value that can make steady voltage output carries out according to random curve to satisfy the power supply demand that requires supply voltage random variation and high-accuracy equipment in certain extent.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description and appended claims, taken in conjunction with the accompanying drawings. In the drawings:
Fig. 1 is a block diagram of a logic structure of a random-curve-variation digital ac voltage-stabilized power supply according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of a random-curve-variation digital ac voltage-stabilized power supply according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The effective value to aforementioned current alternating current voltage-stabilized power supply output is invariable, can not satisfy the problem of the power supply demand of specific high-accuracy equipment, the utility model discloses alternating current with the input is after alternating current filter circuit and bridge rectifier filter circuit rectification filter in proper order, carries out voltage current dicyclo control to the direct current of bridge rectifier filter circuit output through the boost circuit, then the direct current contravariant of boost circuit output is the alternating current through full-bridge inverter circuit, full-bridge inverter circuit's output is again through the closed loop feedback that receives the feedback loop control circuit of little the control of control unit to the effective value of the alternating current of messenger's output changes according to the random curve. The utility model discloses can satisfy one kind and require the power supply demand of supply voltage random variation and at the high-accuracy equipment of certain extent.
For explaining the present invention, fig. 1 shows a logic structure of a random-curve-variation digital ac voltage-stabilized power supply according to an embodiment of the present invention.
As shown in fig. 1, the present invention provides a random curve variation type digital ac voltage-stabilized power supply, which comprises an ac input terminal 110, an ac filter circuit 120, a bridge rectifier filter circuit 130, a boost circuit 140, a full-bridge inverter circuit 150, a feedback loop control circuit 160 and a micro control unit 170.
The ac output terminal 110 is connected to the ac filter circuit 120, and the ac filter circuit 120 performs filtering processing on the input ac power to filter out differential mode interference of the power grid and instantaneous high voltage pulses on the power grid; the output of the ac filter circuit 120 is connected to the bridge rectifier filter circuit 130, and the bridge rectifier filter circuit 130 converts the filtered ac power into unregulated dc power.
The output of the bridge rectifier filter circuit 130 is connected to the boost circuit 140, and the boost circuit 140 performs voltage and current double-loop control on the direct current output by the bridge rectifier filter circuit 130 by adopting a PWM controller and a resistance voltage division type closed loop feedback circuit; the output of the boost circuit 140 is connected to the full-bridge inverter circuit 150, and the full-bridge inverter circuit 150 inverts the dc power output by the boost circuit 140 into ac power.
The output of the full-bridge inverter circuit 150 is connected to the feedback loop control circuit 160, and the micro control unit 170 is connected to the feedback loop control circuit 160; wherein, a random function is pre-stored in the micro control unit 170, the random function generates a random direct current signal, and the feedback signal output by the feedback loop control circuit 160 is formed by overlapping the random direct current signal generated by the random function and the alternating current voltage sampling value; wherein, the ac voltage sampling value is the sampling output of the full bridge inverter circuit 150; the feedback signal output by the feedback loop control circuit 160 is connected to the full-bridge inverter circuit 150, and the feedback signal output by the feedback loop control circuit 160 controls the effective value of the alternating current output by the full-bridge inverter circuit 150 to randomly change within a preset range.
For more clear explanation of the random curve changing type digital ac voltage-stabilized power supply provided by the present invention, fig. 2 shows a circuit structure of a random curve changing type digital ac voltage-stabilized power supply according to an embodiment of the present invention.
As shown in fig. 2, the input ac power is first filtered by an ac filter circuit. The alternating current filter circuit is composed of a voltage dependent resistor R1 and a capacitor C4, the capacitor C4 is used for filtering differential mode interference of a power grid, and the voltage dependent resistor R1 is used for filtering instantaneous high-voltage pulses on the power grid.
The bridge rectifier filter circuit consists of two pairs of bridge arms and a filter capacitor C3, wherein one end of the bridge rectifier filter circuit is grounded, and the other end of the bridge rectifier filter circuit is connected to a boost circuit, and the bridge rectifier filter circuit converts the input alternating current into the unregulated direct current. Specifically, a pair of bridge arms is formed by rectifier diodes D2 and D8, another pair of bridge arms is formed by rectifier diodes D3 and D9, and in order to improve the service life of the alternating current stabilized voltage power supply to the maximum extent, a KXG series high-frequency low-resistance 105-degree electrolytic capacitor is adopted by the filter capacitor C3.
Because the boost circuit adopts the current type PWM controller and the resistance voltage division type closed loop feedback to realize the double loop control of the voltage and the current, the current can be limited cycle by cycle, thereby realizing the stability and the safety of the boost circuit to the maximum extent. Specifically, the boost circuit is composed of an inductor L2, a field effect transistor Q2, a fast recovery diode D1, a resistor R6, a resistor R2, a resistor R9, a filter capacitor C2 and a PWM controller, one end of the boost circuit is grounded, and the other end of the boost circuit is connected to the full-bridge inverter circuit. In order to prolong the service life of the alternating current stabilized voltage power supply to the maximum extent, the filter capacitor C2 also adopts a DXG series high-frequency low-resistance 105-degree electrolytic capacitor.
The full-bridge inverter circuit is composed of an inversion main control chip U4 (the inversion main control chip U4 is a pure sine wave inversion control chip, the model is TDS2285), a bootstrap full-bridge driving circuit connected with the inversion main control chip U4, an inverter bridge circuit connected with the bootstrap full-bridge driving circuit and an LCL filter circuit. The inverter main control chip U4 internally comprises a 10-bit accurate SPWM waveform generator and a high-accuracy closed-loop feedback controller, the temperature range is industrial level and expansion level, the bootstrap full-bridge driving circuit converts SPWM signals sent by the inverter main control chip into signals for driving an inverter bridge circuit, and direct current output by the boost circuit is inverted into high-voltage alternating current through the inverter bridge circuit; the carrier signal in the SPWM signal is filtered through the LCL filter circuit, so that the high-voltage alternating current pure sine wave is output.
Specifically, the LCL filter circuit is composed of inductors L1, L3 and a capacitor C1, the bootstrap full bridge drive circuit is composed of drive chips U5 and U6 (models are IR2103), capacitors C7, C8, diodes D14 and D15, C7 and C8 are bootstrap capacitors, dead time controllers are integrated inside U5 and U6, and can prevent upper and lower bridge arms from going through, the inverter bridge circuit is composed of ultrafast recovery diodes D4, D5, D6, D7, D10, D11, D12, D13 and field effect transistors Q1, Q3, Q4 and Q5, and parasitic diodes are arranged inside the field effect transistors Q1, Q1 and Q1, and a freewheeling circuit needs to flow through the parasitic diodes, but the reverse recovery time of the parasitic diodes is usually very long, and cannot effectively meet the application requirements, so the ultrafast recovery diodes D1, D1 and D1 are added to the inverter bridge circuit.
The feedback loop control circuit is composed of a current transformer U1, a rectifier bridge chip U2 and a DAC chip U3. The current transformer U1 is connected with the full-bridge inverter circuit and is used for converting the high-voltage alternating current output by the full-bridge inverter circuit into low-voltage alternating current; the rectifier bridge chip U2 is connected with the current transformer U1 and is used for converting low-voltage alternating current into low-voltage direct current, and the low-voltage direct current outputs an alternating voltage sampling value after a series of voltage division and filtering of resistors R5, R8 and a capacitor C8; in order to ensure that the effective value of the output alternating current changes according to a random curve, the utility model adopts a DAC chip U3 to realize the function, the model of the DAC chip U3 is DAC7512 which is suitable for low power consumption and high precision application, the precision of an internal DAC is 12 bits, a pin of a micro control unit is connected to the DAC chip U3, so that the output voltage of the U3 is controlled by the micro control chip, a random function is pre-arranged in the micro control unit, the random function randomly generates a number within a preset range, the output value of the random function is refreshed along with the overflow of the timer time of the micro control unit, the micro control unit controls the direct current signal output by the DAC chip U3 to change along with the randomly generated number, in the timer time of the micro control unit, the random direct current signal and the alternating current voltage sampling value output by the DAC chip U3 are jointly used as a feedback signal to be connected to a VAC port of an inversion main control chip U4, and through the, the effective value of the alternating current output by the full-bridge inverter circuit is randomly changed within a preset range.
In addition, in order to realize the steady voltage input of wide range and the steady voltage output of high accuracy, the utility model provides a random curve variation formula digit AC voltage stabilizing power supply adopts second grade closed loop voltage stabilizing structure, and the boost circuit is direct current closed loop voltage stabilizing circuit promptly, and full-bridge inverter circuit is AC closed loop voltage stabilizing circuit.
Additionally, the utility model provides a random curve variation formula digit constant voltage power supply still includes auxiliary power supply circuit, and this auxiliary power supply circuit links to each other with boost circuit and full-bridge inverter circuit, feedback loop control circuit and little the control unit respectively for give boost circuit and full-bridge inverter circuit, feedback loop control circuit and little the control unit power supply respectively. The auxiliary power supply circuit adopts a non-isolated step-down topological structure and outputs 12V voltage and 5V voltage respectively, and the 5V voltage is obtained by linearly reducing the 12V voltage through low voltage difference; the 12V voltage supplies power for the boost circuit and the bootstrap full-bridge driving circuit; the 5V voltage supplies power to the inversion main control chip U4, the DAC chip U3 and the micro control unit.
After electrification, alternating current input voltage is subjected to filtering of burrs and instantaneous high-voltage pulses of a power grid through an alternating current filter circuit and then is changed into direct current voltage which is not stabilized through a bridge rectifier circuit, a boost circuit is formed by a current type PWM chip and resistance voltage division type closed loop feedback, the PWM duty ratio can reach 96% at most, a boost inductor preferably adopts a large inductance Fe-Si-Al magnetic ring, and the boost inductor is high in efficiency, small in heat productivity and stable in work under a high-voltage direct current boost environment. The full-bridge inverter circuit adopts four high-voltage MOS pipes, the SPWM waveform adopts the generation of special pure sine wave controller chip, the fundamental frequency is about 20KHz, the frequency of output sine wave is 50HZ when the crystal oscillator selects 16M, and when the voltage on the VBAT pin exceeds 1.35V and is less than 0.9V, the full-bridge inverter circuit stops working, so the pin voltage value can be set to the specified value through the partial pressure of resistors R10 and R11, for example, under the voltage condition of +5V, R10 is 15K, the VBAT pin will be 1.19V when R11 is 4.7K, and the normal working condition is met. The full-bridge driving circuit adopts bootstrap drive, and the driving chip is internally integrated with a dead time controller, so that the direct connection of upper and lower bridge arms can be prevented, the diodes D14 and D15 need to adopt fast recovery diodes, and the capacities of bootstrap capacitors C7 and C8 cannot be too small.
The utility model provides a technical parameter of random curve variation formula digit alternating current voltage-stabilized power supply as follows:
load property: resistive, capacitive, and inductive;
voltage stabilization precision: plus or minus 1 percent;
outputting a waveform: a pure sine wave;
waveform distortion degree: less than or equal to 1 percent;
output of alternating current frequency: 50 Hz;
power conversion efficiency: more than or equal to 88 percent.
It is required to explain, the utility model discloses an adjusting internal element parameter, can adjusting input voltage's scope and output voltage, consequently can be according to the utility model discloses, set up corresponding input voltage and output voltage to realizing the demand, synthesize the volume and the power of considering constant voltage power supply simultaneously, design the AC voltage power supply that has practical utility.
The invention has been described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that modifications may be made to the invention as described above without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the content of the appended claims.
Claims (8)
1. A random curve variation type digital alternating current stabilized voltage power supply comprises an alternating current input end, and is characterized by further comprising an alternating current filter circuit, a bridge rectifier filter circuit, a boost circuit, a full-bridge inverter circuit, a feedback loop control circuit and a micro control unit; wherein,
the alternating current filter circuit is connected with the alternating current input end and is used for filtering input alternating current;
the bridge rectifier filter circuit is connected with the alternating current filter circuit and is used for converting alternating current subjected to filtering processing into direct current which is not stabilized;
the boost circuit is connected with the bridge rectifier filter circuit, and a PWM controller and a resistance voltage division type closed loop feedback circuit are adopted to carry out voltage and current double loop control on the direct current;
the full-bridge inverter circuit is connected with the boost circuit and is used for inverting the direct current output by the boost circuit into alternating current; wherein,
the feedback loop control circuit is connected with the full-bridge inverter circuit, the micro control unit is connected with the feedback loop control circuit, a random function is preset in the micro control unit, a random direct current signal is generated through the random function, and a feedback signal output by the feedback loop control circuit is formed by superposing the random direct current signal generated by the random function and an alternating current voltage sampling value; the alternating voltage sampling value is the sampling output of the full-bridge inverter circuit;
The feedback signal output by the feedback loop control circuit is connected to the full-bridge inverter circuit, and the effective value of the alternating current output by the full-bridge inverter circuit is controlled to randomly change within the preset range through the feedback signal output by the feedback loop control circuit.
2. The regulated power supply of claim 1 wherein,
the bridge rectifier filter circuit comprises two pairs of bridge arms and a first filter capacitor (C3); wherein,
one end of the bridge rectifier filter circuit is grounded, and the other end of the bridge rectifier filter circuit is connected to the boost circuit.
3. The regulated power supply of claim 1 wherein,
the boost circuit comprises an inductor (L2), a field effect transistor (Q2), a fast recovery diode (D1), a resistor (R6, R2 and R9), a second filter capacitor (C2) and a PWM controller; wherein,
one end of the boost circuit is grounded, and the other end of the boost circuit is connected to the full-bridge inverter circuit.
4. The regulated power supply of claim 1 wherein,
the full-bridge inverter circuit comprises an inverter main control chip, a bootstrap full-bridge driving circuit connected with the inverter main control chip, an inverter bridge circuit connected with the bootstrap full-bridge driving circuit and an LCL filter circuit; wherein,
The bootstrap full-bridge driving circuit converts the SPWM signal sent by the inversion main control chip into a signal for driving the inversion bridge circuit, and the direct current output by the boost circuit is inverted into high-voltage alternating current through the inversion bridge circuit; wherein,
and filtering the carrier signal in the SPWM signal through the LCL filter circuit to output the high-voltage alternating current pure sine wave.
5. The regulated power supply according to claim 4,
the feedback loop control circuit comprises a current transformer (U1), a rectifier bridge chip (U2) and a DAC chip (U3); wherein,
the current transformer (U1) is connected with the full-bridge inverter circuit and is used for converting the high-voltage alternating current output by the full-bridge inverter circuit into low-voltage alternating current;
the rectifier bridge chip (U2) is connected with the current transformer (U1) and is used for converting the low-voltage alternating current into low-voltage direct current, and the low-voltage direct current outputs an alternating voltage sampling value after voltage division and filtering;
the DAC chip (U3) is connected with the micro control unit; wherein,
the inverter comprises a micro control unit, wherein a random function is preset in the micro control unit, the random function randomly generates a number within a preset range, the output value of the random function is refreshed along with the time overflow of a timer of the micro control unit, the micro control unit controls a direct current signal output by a DAC chip (U3) to change along with the randomly generated number, the random direct current signal output by the DAC chip (U3) and an alternating current voltage sampling value are connected to an inverter main control chip together as feedback signals within the time of the timer of the micro control unit, and the effective value of alternating current output by the inverter full bridge circuit randomly changes within the preset range through the combined action of the random direct current signal and the alternating current voltage sampling value.
6. The regulated power supply of claim 1 wherein,
the boost circuit is a direct current closed loop voltage stabilizing circuit;
the full-bridge inverter circuit is an alternating current closed-loop voltage stabilizing circuit.
7. The regulated power supply according to any one of claims 1-6, further comprising an auxiliary power supply circuit, said auxiliary power supply circuit being connected to said boost circuit and said full bridge inverter circuit, feedback loop control circuit and micro control unit, respectively, for supplying power to said boost circuit and said full bridge inverter circuit, feedback loop control circuit and micro control unit, respectively.
8. The regulated power supply according to claim 7 wherein said auxiliary power circuit employs a non-isolated buck topology; wherein,
the auxiliary power supply circuit respectively outputs 12V voltage and 5V voltage, and the 5V voltage is obtained by linearly reducing the 12V voltage through low voltage difference; wherein,
the 12V voltage supplies power to the boost circuit and the bootstrap full-bridge driving circuit;
the 5V voltage supplies power to the inversion main control chip, the DAC chip (U3) and the micro control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620099972.5U CN205544953U (en) | 2016-02-01 | 2016-02-01 | Random graph changes formula digit voltage regulator power |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620099972.5U CN205544953U (en) | 2016-02-01 | 2016-02-01 | Random graph changes formula digit voltage regulator power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576995A (en) * | 2016-02-01 | 2016-05-11 | 兰州智豆信息科技有限公司 | Random curve change type digital alternating current voltage stabilized power supply |
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2016
- 2016-02-01 CN CN201620099972.5U patent/CN205544953U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576995A (en) * | 2016-02-01 | 2016-05-11 | 兰州智豆信息科技有限公司 | Random curve change type digital alternating current voltage stabilized power supply |
| CN105576995B (en) * | 2016-02-01 | 2018-06-22 | 兰州智豆信息科技有限公司 | Random graph varying type Digital AC regulated power supply |
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Granted publication date: 20160831 Effective date of abandoning: 20180622 |
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